[hinterlands]

I'm not quite sure what you're saying here. My assertion is that a visible image persists on the screen longer than it appears in the slo-mo clip. You can just point a camera with an adjustable shutter speed at a CRT and see it for yourself. Here's an example (might need to copy the URL and open in a new tab, they don't like hotlinking):

https://i.sstatic.net/5K61i.png

The brightly-lit band is the part of the frame scanned by the beam while the shutter was open. The part above is the afterimage, which, while not as bright, is definitely there.

[layer8]

That link shows an error with Access Denied to me. I didn’t deny that an afterimage is there. I meant to point out that the brightest part by far, which what is most prominently perceived by the eye, isn’t much more than one scanline, in SD.

[cubefox]

> The part above is the afterimage, which, while not as bright, is definitely there.

Yes it's there, but it's much less bright than the the scanned area, so it will be hardly perceptible relative to the bright part. The receptors in the eye will hardly respond to it after being excited so strongly by the bright part.